ZAGREB, Croatia (AP) — Croatia's upcoming parliamentary election, set for Wednesday, follows a campaign that was marked by heated exchanges between the country’s two top officials, sparking a political crisis in the Balkan country that belongs to both the European Union and NATO.

The ballot will pit the ruling conservative Croatian Democratic Union (HDZ) led by incumbent Prime Minister Andrej Plenkovic against an alliance of centrist and left-wing parties informally led by populist President Zoran Milanovic and his Social Democratic Party (SDP).

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